As far as Russia benefiting from the election, what benefit do you think Russia gets out of the situation that isn't just a large, common benefit that could be equally attributable to anyone?
EG: if you say Russia wanted Trump elected because Trump would be a better friend to Russia that doesn't convince me that Russia was involved in that at all. Fixing Russia/US relations has massive, global benefit, it seems equally fair to say that Belgium hacked the election (whatever that means) to prevent Hillary from ending up in a nuclear war with Russia which would obviously be bad for, well, everyone (to be crystal clear, i'm not saying this is true or that I believe this would have happened).
My point isn't that everything I'm saying is correct, merely that there are lots of equally plausible scenarios here.